P6 - Molecules And Matter

Question 1

What is latent heat?

Answer 1

The energy needed for a substance to change state, the energy supplied changes the internal energy but not the temperature

Question 2

What is specific latent heat?

Answer 2

The amount of energy needed to change the state of 1 kilogram of a substance with no change in temperature.

Question 3

What is internal energy?

Answer 3

Energy is stored inside a system by the particles that make up the system

Question 4

How are particles arranged in a solid?

Answer 4

Particles are arranged in rows and vibrate about a fixed position

Question 5

How are particles arranged in a liquid?

Answer 5

Particles are closely packed but not arranged in rows

Question 6

How are particles arranged in a gas?

Answer 6

Particles are in constant random motion

Question 7

How does increasing temperature affect the particle model?

Answer 7

• kinetic energy of the particles is higher —> particles move faster
• at a constant volume, pressure also increases due to particles moving faster and therefore colliding with the walls more often

Question 8

What happens to mass in a change of state?

Answer 8

Mass is conserved

Question 9

What kind of change is a change of state? Why?

Answer 9

• physical change
• the material recovers its original properties if the change is reversed